Refer to See note 10. See Note 3. Refer to Section 3 Symptom Charts. GO to Injection Control Pressure (ICP) System Test. GO to Injection Control Pressure (ICP) Sensor Test. GO to Injection Control Pressure (ICP) System Test.

2004 F650/F750 6.0L Diesel

Diagnostic Trouble Code (DTC) Charts

6.0L Diesel DTCs Chart

Diagnostic Trouble Code (DTC) 334 335 341* 342* 343* 344* 345 346 351 353 354 355 361 365* 366* 367* 421-428 431-438 451-458 523 525* 533 534 543* Application ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL Continuous Memory GO to Injection Control Pressure (ICP) System Test. GO to Injection Control Pressure (ICP) System Test. GO to Exhaust Back Pressure (EBP) Sensor Test. GO to Exhaust Back Pressure (EBP) Sensor Test. GO to Air Management System Test. GO to Exhaust Back Pressure (EBP) Sensor Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Air Management System Test. GO to Injector Drive Circuits Test. GO to Injector Drive Circuits Test. GO to Injector Drive Circuits Test. GO to Injection Driver Module Power (IDM PWR) Test. GO to Injection Driver Module Power (IDM PWR) Test. GO to Injection Driver Module Power (IDM PWR) Test. GO to Injection Driver Module Power (IDM PWR) Test. GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications Test. GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications Test. GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications Test. GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications Test. GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications Test. See Note 4.

551

ALL

552

ALL

553

ALL

554

ALL

571-578*

(Continued) 2004 F650/F750 6.0L Diesel

ALL

Diagnostic Trouble Code (DTC) Charts

6.0L Diesel DTCs Chart

Diagnostic Trouble Code (DTC) 613* 614* 621* 622* 623* 624 626 631 632 655 661 664 665 Application ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL ALL Continuous Memory See Note 5. See Note 6. See Note 7. See Note 7. See Note 6. See Note 7. GO to Powertrain Control Module Power (PCM PWR) Test. See Note 8. See Note 8. See Note 7. See Note 8. See Note 7. See Note 8.

(1) Note 1: * Indicates amber ENGINE indicator on when a Diagnostic Trouble Code (DTC) is set. (2) Note 2: ** Indicates red ENGINE indicator on if the Engine Warning Protection System (EWPS) is enabled and a DTC is set. (3) Note 3: DTC 324 does not indicate any system or circuit fault. Diagnostic tests are not required for this DTC. (4) Note 4: When DTCs are set for cylinder balance, perform all Performance Diagnostics Tests. Refer to Section 4. (5) Note 5: Install correct PCM or IDM. (6) Note 6: Check engine family rating code (EFRC) for the current PCM strategy. Reprogram the PCM or change the EFRC as required. Refer to Section 2. (7) Note 7: Reprogram the PCM. Refer to Section 2. (8) Note 8: Install a new PCM. (9) Note 9: DTC 316 only indicates the engine has not been able to reach operating temperature. It does not indicate a circuit fault. Refer to the Workshop Manual for cooling system diagnostics. (10) Note 10: If coolant level is correct, GO to Engine Coolant Level (ECL) Sensor Test. (11) Note 11: Refer to the Workshop Manual for cooling system diagnostics.

Possible Causes No errors detected · DTC 112 is set when the PCM detects a generator output greater than 23 volts at pin X3-3 for more than 0.5 seconds. · DTC 112 can be set when jump starting the engine and additional voltage is introduced. Incorrect external battery connections can cause the voltage increase. · If the condition causing DTC 112 is intermittent, the code will change from active to inactive status. DTC 112 will not cause the amber ENGINE indicator to turn on. · DTC 113 can be set by a defective generator or PCM power relay, discharged batteries, or increased resistance in the battery feed circuits. · If the condition causing DTC 113 is intermittent, the code will change from active to inactive status. DTC 113 will not cause the amber ENGINE indicator to turn on.

Diagnostic Aids No errors detected The PCM monitors the VREF voltage and will adjust the signal values for the sensors that use VREF for operation. If a sensor or circuit pulls VREF lower than 5 volts, the PCM may set out of range high DTCs for the sensors that operate on VREF (APS, BAP, B+, and VSS).

The PCM internally monitors battery voltage. When the PCM continuously receives greater than 23 volts a DTC will be set.

113 -- Electrical System Voltage B+ Out Of Range Low

The PCM internally monitors battery voltage. When the PCM continuously receives less than 7.0 volts, a DTC will be set.

DTC 113 is set when the PCM detects less than 7.0 volts at pin X3-3 for more than 0.5 seconds.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 114 -- Engine Coolant Temperature Signal Out Of Range Low

Description The PCM continuously monitors the signal of the ECT sensor to determine if the signal is within an expected range. If the PCM detects an out of range high or low, the PCM will ignore the ECT signal and assume an engine coolant temperature of -34°C (-29°F) for starting and 82°C (180°F) for engine running conditions. When this occurs, the EWPS, CAP, IST, cold idle advance, and coolant compensation features are disabled. The PCM continuously monitors the signal of the ECT sensor to determine if the signal is within an expected range. If the PCM detects an out of range high or low, the PCM will ignore the ECT signal and assume an engine coolant temperature of -34°C (-29°F) for starting and 82°C (180°F) for engine running conditions. When this occurs, the EWPS, CAP, IST, cold idle advance, and coolant compensation features are disabled The PCM will ignore the MAP signal when the signal is detected to be out of range or an incorrect value is read. The engine will continue to operate based on estimated values. The PCM will ignore the MAP signal when the signal is detected to be out of range or an incorrect value is read. The engine will continue to operate based on estimated values.

Possible Causes · DTC 114 is set by the PCM when the ECT signal is less than 0.127 volts for more than 0.35 seconds. · DTC 114 can set due to a short to ground in the signal circuit or a defective sensor. · When DTC 114 is set the amber ENGINE indicator is illuminated.

Diagnostic Aids Signal voltage was less than 0.127 volts for more than 0.35 seconds.

115 -- Engine Coolant Temperature Signal Out Of Range High

· DTC 115 is set by the PCM when the ECT signal is greater than 4.6 volts for more than 0.35 seconds. · DTC 115 can set due to an open signal or ground circuit, a short to a voltage source, or a defective sensor. · When DTC 115 is set the amber ENGINE indicator is illuminated.

Signal voltage was greater than 4.6 volts for more than 0.35 seconds.

121 -- Intake Manifold Absolute Pressure Signal Out Of Range High

· DTC 121 can be set due to a sensor signal wire short to VREF or B+ or a defective MAP sensor · When DTC 121 is active the amber ENGINE indicator is illuminated. · DTC 122 can be set due to a sensor signal circuit open or shorted to ground or a defective MAP sensor. DTC 122 can also be set due to an extremely restricted CAC/intake system. · When DTC 122 is active the amber ENGINE indicator is illuminated.

DTC 121 is set by the PCM when the MAP signal is greater than 4.9 volts for more than 0.4 seconds.

122 -- Intake Manifold Absolute Pressure Signal Out Of Range Low

DTC 122 is set by the PCM when the MAP signal is less than 0.039 volts for more than 0.4 seconds.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 123 -- Intake Manifold Absolute Pressure Signal In-Range Fault

Description The PCM will ignore the MAP signal when the signal is detected to be out of range or an incorrect value is read. The engine will continue to operate based on estimated values.

Possible Causes · DTC 123 can be set due to a restricted or plugged sensor inlet, VREF shorted to a voltage source greater than 5.5 volts, or a defective MAP sensor. · When DTC 123 is active the amber ENGINE indicator is illuminated. · DTC 124 can be set due to an open or short to ground on the signal circuit, a defective sensor or an open VREF circuit or a VREF circuit short to ground. · When DTC 124 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 123 is set by PCM when the MAP signal is greater than 120 kPa (2 psi) absolute at low idle.

124 -- Injection Control Pressure Signal Out Of Range Low

The PCM continuously monitors the signal of the ICP sensor to determine if the signal is within an expected range. If the PCM detects a higher or lower voltage than expected, the PCM will set a DTC, illuminate the amber ENGINE indicator, ignore the ICP sensor signal, and use a preset value based on engine operating conditions. The PCM continuously monitors the signal of the ICP sensor to determine if the signal is within an expected range. If the PCM detects a higher or lower voltage than expected, the PCM will set a DTC, illuminate the amber ENGINE indicator, ignore the ICP sensor signal, and use a preset value based on engine operating conditions.

DTC 124 is set by the PCM if signal voltage is less than 0.039 volts for more than 0.1 seconds.

125 -- Injection Control Pressure Signal Out Of Range High

· DTC 125 can be set due to an open signal ground circuit, short to a voltage source on the ICP signal circuit, or a defective sensor. · When DTC 125 is active the amber ENGINE indicator is illuminated.

DTC 125 is set by the PCM if the signal voltage is greater than 4.9 volts for more than 0.1 seconds.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 131 -- APS Signal Out Of Range Low

Description The PCM continuously monitors the APS/IVS circuits for expected voltages. It also compares the APS and IVS signals for conflict. If the PCM detects an APS signal out of range low, the engine will ignore the APS signal and operate at low idle.

Possible Causes · Possible causes include a short to ground or an open in the APS signal circuit. · DTC 131 can be set due to a short to ground or an open VREF or signal circuits. If the condition causing DTC 131 is intermittent and the condition is no longer present, the code will become inactive and normal engine operation will resume. · When DTC 131 is active the amber ENGINE indicator is illuminated. · DTC 132 can be set due to a short to VREF or B+ in the APS signal circuit. · When DTC 132 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 131 is set if the PCM detects voltage less than 0.147 volts.

132 -- APS Signal Out Of Range High

The PCM continuously monitors the APS/IVS circuits for expected voltages. It also compares the APS and IVS signals for conflict. If the PCM detects an APS signal out of range high, the engine will ignore the APS signal and operate at low idle.

DTC 132 is set if the PCM detects a voltage greater than 4.55 volts. The PCM monitors voltage on VREF A and will adjust signal values for the sensors that use VREF A for operation. If a sensor or circuit pulls VREF less than 5 volts, the PCM may set out of range high DTCs for the sensors that operate on VREF B (APS, BAP, B+, and VSS). DTC 133 is caused by intermittent conditions. The DTC will remain active until the vehicle has been shutdown and restarted. The DTC does not recover without cycling the key switch.

133 -- APS Signal In Range DTC

The PCM checks the voltage output of the APS by comparing the APS signal with the IVS signal. APS and IVS signals can disagree in two cases: · The APS signal indicates the pedal is pressed down to accelerate, but the IVS signal indicates idle position. · The APS signal indicates the pedal has been released to allow the engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC.

· If the IVS signal is changing and the APS signal is constant, the PCM assumes the APS is the conflict source and sets DTC 133. The engine rpm is restricted to idle. · When DTC 133 is active the amber ENGINE indicator is illuminated.

(Continued) 2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 134 -- APS Signal And IVS Disagree

Description The PCM checks the voltage output of the APS by comparing the APS signal with the IVS signal. APS and IVS signals can disagree in two cases: · The APS signal indicates the pedal is pressed down to accelerate, but the IVS signal indicates idle position. · The APS signal indicates the pedal has been released to allow the engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC. The PCM checks the voltage output of the APS by comparing the APS signal with the IVS signal. APS and IVS signals can disagree in two cases: · The APS signal indicates the pedal is pressed down to accelerate, but the IVS signal indicates idle position · The APS signal indicates the pedal has been released to allow the engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC.

Possible Causes · If neither the APS or IVS is changing, or both are changing, or the PCM cannot determine the DTC in specified time, DTC 134 is set and engine rpm is restricted to idle. · When DTC 134 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 134 is caused by intermittent conditions. The DTC will remain active until the vehicle has been shutdown and restarted. The DTC does not recover without cycling the key switch.

135 -- Idle Validation Switch Circuit Fault

· If the APS is changing but IVS is constant, the PCM assumes the IVS is the conflict source and sets DTC 135. In this case the PCM limits the APS signal to a lower value that provides less than full rpm, but does not limit engine rpm to idle. · When DTC 135 is active the amber ENGINE indicator is illuminated.

DTC 135 is caused by intermittent conditions. The DTC will remain active until the vehicle has been shutdown and restarted. The DTC does not recover without cycling the key switch.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 141 -- Vehicle Speed Sensor Signal Out Of Range Low

Description The PCM performs diagnostic checks on the VSS circuit when the engine is operating at 0 mph. The PCM transmits a voltage signal on the VSS circuit and determines if the return voltage is out of range high or low. When a fault condition is detected, the PCM disables the cruise control and power takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. The PCM performs diagnostic checks on the VSS circuit when the engine is operating at 0 mph. The PCM transmits a voltage signal on the VSS circuit and determines if the return voltage is out of range high or low. When a fault condition is detected, the PCM disables the cruise control and power takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. An inactive CMP signal during cranking is detectable by the PCM. During engine cranking the PCM monitors the CKP signal and Injection Control Pressure (ICP) to verify the engine is rotating. If the CMP signal is inactive during this time a DTC will be set. Electrical noise can also be detected by the PCM. When the level is sufficient to affect engine operation, a corresponding DTC will be set.

Possible Causes · DTC 141 is set by the PCM when an out of range low condition is detected in the VSS circuit. · When DTC 141 is active the amber ENGINE indicator is not illuminated.

Diagnostic Aids The PCM will not set DTCs for VSS circuit failure for vehicles equipped with Allison MD (WTEC) and 2000 series transmissions. For vehicles equipped with MD transmissions, diagnose the communication circuit (CAN 1) between the engine and transmission module.

142 -- Vehicle Speed Sensor Signal Out Of Range High

· DTC 142 is set by the PCM when an out of range high condition is detected in the VSS circuit. · When DTC 142 is active the amber ENGINE indicator is not illuminated.

The PCM monitors voltage on VREF A and will adjust signal values for the sensors that use VREF A for operation. If a sensor or circuit pulls VREF less than 5 volts, the PCM may set out of range high DTCs for the sensors that operate on VREF B (APS, BAP, B+, and VSS).

143 -- Incorrect CMP Signal Signature

· DTC 143 is set by the PCM when the CMP transition occurs at the wrong CKP location. · DTC 143 can be set due to a mistimed CMP to CKP signal, electrical noise in the CMP circuit, or a defective CMP sensor.

An inactive CMP signal will cause a no start condition.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 145 -- CMP Signal Inactive

Description An inactive CMP signal during cranking is detectable by the PCM. During engine cranking the PCM monitors the CKP signal and Injection Control Pressure (ICP) to verify the engine is rotating. If the CMP signal is inactive during this time a DTC will be set. Electrical noise can also be detected by the PCM. When the level is sufficient to affect engine operation, a corresponding DTC will be set. An inactive CKP signal during cranking is detectable by the PCM. During engine cranking the PCM monitors the CMP signal and injection control pressure to verify the engine is rotating. If the CKP signal is inactive during this time a DTC will be set. Electrical noise can also be detected by the PCM, if the level is sufficient to effect engine operation, a corresponding DTC will be set. An inactive CKP signal during cranking is detectable by the PCM. During engine cranking the PCM monitors the CMP signal and injection control pressure to verify the engine is rotating. If the CKP signal is inactive during this time a DTC will be set. Electrical noise can also be detected by the PCM. If the level is sufficient to affect engine operation, a corresponding DTC will be set.

Possible Causes · DTC 145 is set by the PCM when the CMP signal is inactive, the CKP signal is active, and the ICP has increased. · DTC 145 can be set due to an open short to ground or open voltage source in the CMP circuit. A defective sensor can cause DTC 145 to be set.

Diagnostic Aids An inactive CMP signal will cause a no start condition.

146 -- CKP Signal Inactive

· DTC 146 is set by the PCM when no CKP signal is detected while the CMP signal is active and ICP has increased. · DTC 146 can be set due to an open short to ground or voltage source in the CKP circuit. A defective CKP sensor can also set DTC 146.

An inactive CKP signal will cause a no start condition.

147 -- Incorrect CKP Signal Signature

· DTC 147 is set by the PCM when the CKP signal has too few or many transitions per engine rotation. · DTC 147 can be set due to an electrical noise in the CKP circuit or a defective CKP sensor.

An inactive CKP signal will cause a no start condition.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 151 -- Barometric Absolute Pressure Signal Out Of Range High

Description When the PCM detects the BAP voltage signal out of range high, the PCM will ignore the BAP signal and use the Manifold Absolute Pressure (MAP) signal generated at low idle as an indication of barometric pressure. When a MAP fault is detected, the BAP signal will default to barometric pressure at sea level, 100.24 kPa (29.6 in Hg). When the PCM detects the BAP voltage signal out of range low, the PCM will ignore the BAP signal and use the Manifold Absolute Pressure (MAP) signal generated at low idle as an indication of barometric pressure. When a MAP fault is detected, the BAP signal will default to barometric pressure at sea level, 100.24 kPa (29.6 in Hg). When the PCM detects an IAT signal out of range low, the PCM will ignore the IAT signal and assume an ambient temperature of 25°C (77°F). When the PCM detects an IAT signal out of range high, the PCM will ignore the IAT signal and assume an ambient temperature of 25°C (77°F).

Possible Causes · DTC 151 is set when the BAP signal is greater than 4.95 volts for more than 0.5 seconds. · DTC 151 can be set when the signal circuit is shorted to VREF or B+. A defective BAP sensor can also set DTC 151. · When DTC 151 is set the amber ENGINE indicator is illuminated.

Diagnostic Aids The PCM monitors voltage on VREF A and will adjust signal values for the sensors that use VREF A for operation. If a sensor or circuit pulls VREF less than 5 volts, the PCM may set out of range high DTCs for the sensors that operate on VREF B (APS, BAP, B+, and VSS).

152 -- Barometric Absolute Pressure Signal Out Of Range Low

· DTC 152 can be set when the signal circuit is shorted to ground or open. If VREF is shorted to ground, DTC 152 can be set. A defective BAP sensor can set DTC 152. · When DTC 152 is set the amber ENGINE indicator is illuminated.

DTC 152 is set when the BAP signal is less than 1.0 volts for more than 0.5 seconds.

154 -- Inlet Air Temperature Signal Out Of Range Low

· DTC 154 can be set due to a short to ground in the signal circuit or a defective IAT sensor. · When DTC 154 is set, the amber ENGINE indicator is illuminated. · DTC 155 can set due to an open signal or ground circuit, a short to a voltage source, or a defective sensor. · When DTC 155 is active, the amber ENGINE indicator is illuminated. · DTC 161 can be set due to a short to ground in the signal circuit or a defective sensor. · When DTC 161 is active the amber ENGINE indicator is illuminated.

DTC 154 is set by the PCM if signal voltage is less than 0.127 volts for more than 0.35 seconds. When DTC 154 is set, the PCM will default to 25°C (77°F) for starting DTC 155 is set by the PCM if signal voltage is greater than 4.6 volts for more than 0.35 seconds. When DTC 155 is set, the PCM will default to a value of 25°C (77°F) for starting. DTC 161 is set by the PCM when the signal voltage is less than 0.098 volts for more than 0.35 seconds.

155 -- Inlet Air temperature Signal Out Of Range High

161 -- Manifold Air Temperature Signal Out Of Range Low

The PCM continuously monitors the signal of the MAT sensor to determine if the signal is within an expected range. If the PCM detects the signal voltage is higher or lower than expected, the PCM will set a DTC.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 162 -- Manifold Air Temperature Signal Out Of Range High

Description The PCM continuously monitors the signal of the MAT sensor to determine if the signal is within an expected range. If the PCM detects the signal voltage is higher or lower than expected, the PCM will set a DTC. The EGRP sensor is calibrated to zero position each time the key is cycled to allow compensation if carbon deposits develop on the valve. If the deposits get so heavy that the position is out of range to zero, a DTC will be set, the valve will close. When the EGRP signal voltage is detected out of range high or low, the PCM will cause the engine to ignore the EGRP signal and the EGR valve will close. The EGRP sensor is calibrated to zero position each time the key is cycled to allow compensation if carbon deposits develop on the valve. If the deposits get so heavy that the position is out of range to zero, a DTC will be set, the valve will close. When the EGRP signal voltage is detected out of range high or low, the PCM will cause the engine to ignore the EGRP signal and the EGR valve will close. When the EOP signal voltage is detected out of range low, the PCM will cause the engine to ignore the EOP signal and disable the Engine Warning and Protection System (EWPS).

Possible Causes · DTC 162 can be set due to an open signal or ground circuit , short to a voltage source, or a defective sensor. · When DTC 162 is active the amber ENGINE indicator is illuminated. · DTC 163 is set by the PCM when the EGRP voltage is greater than 0.3 volts for more than 0.35 seconds. · DTC 163 can be set due to an open or short to ground on the signal circuit, a defective sensor or an open VREF circuit or a VREF circuit short to ground. · When DTC 163 is active the amber ENGINE indicator is illuminated. · DTC 164 is set by the PCM when the EGRP voltage is greater than 4.5 volts for more than 0.35 seconds. · DTC 164 can be set due to an open or short to ground on the signal circuit, a defective sensor or an open VREF circuit or VREF short to ground. · When DTC 164 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 162 is set by PCM when the signal voltage is greater than 4.58 volts for more than 0.35 seconds.

The EGR actuator can be tested for a stuck or sticking valve by performing an Output State Low Test while monitoring EGRP percentage. Refer to Section 4 Performance Diagnostics.

164 -- Exhaust Gas Recirculation Valve Position Signal Out Of Range High

The EGR actuator can tested for a stuck or sticking valve by performing an Output State Low Test while monitoring EGRP percentage. Refer to Section 4 Performance Diagnostics.

211 -- Engine Oil Pressure Signal Out Of Range Low

· DTC 211 can be set due to an open or short to ground on the signal circuit, a defective sensor or an open VREF circuit or VREF short to ground. · When DTC 211 is active the amber ENGINE indicator is illuminated.

DTC 211 is set by the PCM when the EOP signal is less than 0.039 volts for more than 0.35 seconds.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 212 -- Engine Oil Pressure Signal Out Of Range High

Description When the EOP signal voltage is detected out of range high, the PCM will cause the engine to ignore the EOP signal and disable the Engine Warning and Protection System (EWPS).

Possible Causes · DTC 212 can be set due to an open signal ground circuit, short to a voltage source on the ICP signal circuit, or a defective sensor. · When DTC 212 is set the amber ENGINE indicator is illuminated. · DTC 215 is set by the PCM when the PCM detects a VSS signal greater than 4365 Hz.

Diagnostic Aids DTC 212 is set by the PCM when the EOP signal is greater than 4.9 volts for more than 0.35 seconds.

215 -- Vehicle Speed Sensor Signal Frequency Out Of Range High

The PCM performs diagnostic checks on the VSS circuit when the engine is operating at 0 mph. The PCM transmits a voltage signal on the VSS circuit and determines if the return voltage is out of range high or low. When a fault condition is detected, the PCM disables the cruise control and power takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. When the EOP signal voltage is detected out of range high, the PCM will cause the engine to ignore the EOP signal and disable the Engine Warning and Protection System (EWPS).

The PCM will not set DTCs for VSS circuit failure for vehicles equipped with Allison MD (WTEC) and 2000 series transmissions. Vehicles equipped with MD transmissions only diagnose the communication circuit (CAN 1) between the engine and transmission module.

225 -- EOP Sensor Signal In Range Fault

· DTC 225 is set by the PCM when the EOP signal voltage is higher than expected with the key ON and the engine OFF. · DTC 225 can be set due to a biased circuit or a defective EOP sensor. · When DTC 225 is active the amber ENGINE indicator is illuminated.

KOEO Engine oil pressure is greater than 15 psi.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 231 Data Communication Link Error

Description The PCM continuously monitors the datalink for an open, short or intermittent connection. If an active DTC occurs on the datalink, the diagnostic software will not display correct data.

Possible Causes · DTC 231 is set when the PCM cannot access the datalink. When this occurs, data cannot be retrieved using the scan tool. DTCs can only be retrieved using the cruise control feature. · DTC 231 can be set when the any of the following conditions occur: · Defective device (transmission controller or anti-lock brake controller) is connected to the bus and pulls signal to ground. · Number of devices exceeds limit · Defective PCM · When DTC 231 is active the amber ENGINE indicator is not illuminated. · DTC 236 can be set when a high resistance connection or intermittent short to ground in the circuit exists. · DTC 236 will not cause the red ENGINE indicator to illuminate. If the condition is intermittent, the DTC will be logged as inactive.

Diagnostic Aids Vehicles equipped with the Allison WTEC transmission may display DTC 231 when attempting to program the PCM. The WTEC controller must be disconnected when programming the engine PCM.

236 ECL Switch Circuit Fault

The PCM continuously monitors the ECL circuit for in-range faults. The PCM does not detect open or short circuits in the ECL system. When the PCM detects an in-range fault, DTC 236 will be set.

Signal voltage was greater than 3.4 volts or less than 4.3 volts more than 2.0 seconds.

Description An open or short to ground in the EGR control circuit can be detected by an on demand output circuit check during KOEO Standard tests. If there is a circuit fault detected a DTC will be set. When the engine is running, the PCM can detect if the injection control pressure is equal to the desired pressure. When the measured injection control pressure does not compare to the desired pressure, the PCM will ignore the measured ICP signal and control the engine with the desired value. An open or short to ground in the EFAN can be detected by the PCM during an on-demand engine standard test. The IAT and ECT are monitored continuously. If a DTC is detected in the IAT or ECT, the EFAN control is disabled and the engine fan is on all the time. An open or short to ground in the glow plug relay circuit can be detected by an on demand output circuit check performed during the KOEO Standard tests. When a circuit fault is detected, a DTC will be set. A fault in the Radiator Shutter Enable (RSE) circuit can be detected by an on demand output circuit check during KOEO Standard test.

Possible Causes · DTC 241 is set by the PCM when the OCC test has failed after the KOEO Standard test has been run. · DTC 241 can be set when a poor connection to the IPR solenoid or defective IPR coil exists. · When DTC 241 is set the engine will not run and the amber ENGINE indicator will not be illuminated.

· DTC 246 is set by the PCM only during the KOEO Standard test. During this test the PCM performs an output circuit test that momentarily enables the EFAN solenoid and measures the voltage drop across the relay · DTC 251 can be set for an open or shorted GPC signal circuit, an open feed circuit, or an open glow plug relay coil.

Before diagnosing, verify the PCM is programmed correctly. Verify the vehicle has an electronic fan.

251 -- Glow Plug Control Output Circuit Check (OCC) Self-test Failed

Glow plug and glow plug harness problems cannot be detected by the PCM.

Description An open or short to ground in the VGT control circuit can be detected by an on demand output circuit check during KOEO Standard tests. If there is a circuit fault detected a DTC will be set. When the engine is running, the PCM can detect if the exhaust back pressure is equal to the desired pressure. When the measured exhaust back pressure does not compare to the desired pressure, the PCM will ignore the measured EBP signal and will control the engine with the desired value. An open or short to ground in the EGR control circuit can be detected by an on demand output circuit check during KOEO standard test. If there is a circuit fault detected a DTC will be set. When the on demand engine on standard test is performed, an open or short to ground can be detected on the coil side of the ECI relay. The EOT sensor provides a feedback signal to the PCM indicating engine oil temperature. The PCM monitors the EOT signal to control fuel quantity and timing throughout the operating range of the engine. During engine operation, if the PCM recognizes that the EOT signal is lower or higher than the expected value it will set a DTC.

Possible Causes · DTC 261 can be set when an open or short to ground in the VGT control circuit or a defective VGT coil exists.

Diagnostic Aids DTC 261 can be set when a poor connection to the VGT solenoid exists.

· DTC 267 can be set due an open or short to ground on the coil side of the ECI relay.

If the engine cranks when the start switch is engaged, check for failed ECI relay or problems with the PCM or PCM wiring harness. DTC 311 is set by the PCM when the EOT signal is less than 0.2 volts for more than 0.35 seconds.

311 -- Engine Oil Temperature Signal Out Of Range Low

· DTC 311 can be set due to a sensor signal wire short to ground or a defective EOT sensor. · When DTC 311 is active the amber ENGINE indicator is illuminated.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 312 -- Engine Oil Temperature Signal Out Of Range High

Description The EOT sensor provides a feedback signal to the PCM indicating engine oil temperature. The PCM monitors the EOT signal to control fuel quantity and timing throughout the operating range of the engine. During engine operation, if the PCM recognizes that the EOT signal is lower or higher than the expected value it will set a DTC. · DTC 313 is set by the PCM when the oil pressure has dropped below the warning level. The specifications for the warning level are : · 34 kPa (5.0 psi) @ 700 rpm · 69 kPa (10.0 psi) @ 1400 rpm · 138 kPa (20.0 psi) @ 2000 rpm · DTC 314 is set by the PCM when the oil pressure has dropped below the critical level. The specification for the critical level is: · 14 kPa (2.0 psi) @ 700 rpm · 34 kPa (5.0 psi) @ 1400 rpm · 152 kPa (12.0 psi) @ 2000 rpm DTC 315 is set by the PCM when the engine rpm has exceeded 3350 rpm.

Possible Causes · DTC 312 can be set due to a signal or ground circuit open, a short to a voltage source, or a defective EOT sensor. · When DTC 312 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 312 is set by the PCM when the EOT signal is greater than 4.8 volts for more than 0.35 seconds.

313 -- Engine Oil Pressure Below Warning Level

· DTC 313 can be set due to a defective sensor sending an incorrect signal. Low oil pressure due to defective mechanical components will also set DTC 313. · The PCM illuminates the red ENGINE indicator and sounds an audible alarm. · DTC 314 can be set due to a defective sensor sending an incorrect signal. Low oil pressure due to defective mechanical components will also set DTC 314. · The PCM illuminates the red ENGINE indicator and sounds an audible alarm. · DTC 315 can be set due to any of the following conditions: · Excessive engine speed in an unintended downshift. · Steep acceleration downhill without correct brake application. · External fuel source being ingested into air intake system. · When DTC 315 is active the amber ENGINE indicator is illuminated.

Compare the actual oil pressure to the reading on the data list of the scan tool.

314 -- Engine Oil Pressure Below Critical Level

Compare the actual oil pressure to the reading on the data list of the scan tool.

315 -- Engine Speed Above Warning level

The engine hours and miles of the last two over speed occurrences will be recorded in the Engine Event Log.

Description · DTC 316 is set if the engine does not reach operating temperature. DTC 316 will only be set with engines that have cold ambient protection (CAP) strategy enabled. DTC 316 is set after the engine has run for more than 120 minutes and has not exceeded the following specifications for engine coolant temperature: · Manual transmission 65° C (149° F) · Automatic transmission 60° C (140° F) DTC 321 is set by the PCM when the engine coolant temperature is above 109°C (228°F).

Diagnostic Aids DTC 316 only indicates the engine has not been able to reach operating temperature. It does not indicate an electronic fault.

321 -- Engine Coolant Temperature Above Warning Level

· The PCM illuminates the red ENGINE indicator and sounds the audible alarm. · When the temperature drops below 109°C (228°F) the DTC will become inactive. · The PCM illuminates the red ENGINE indicator and sounds the audible alarm. · When the temperature drops below 112.5°C (234.5°F) the DTC will become inactive. · When the coolant has returned to correct levels, DTC 323 will become inactive. The PCM will log the engine hours and odometer reading at the time of occurrence. After the shutdown, the engine can be restarted for thirty seconds.

The PCM will log the engine hours and odometer reading at the time of occurrence.

322 -- Engine Coolant Temperature Above Critical Level

DTC 322 is set by the PCM when the engine coolant temperature is above 112.5°C (234.5°F).

The PCM will log the engine hours and odometer reading at the time of occurrence.

323 -- Engine Coolant Level Below Warning/Critical Level

DTC 323 is set by the PCM when coolant is low. When the EWPS mode is 3-way protection and DTC 323 is active, the engine will shutdown.

If coolant level is correct, an ECL signal shorted to ground can cause DTC 323.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 324 -- Idle Shutdown Timer Enabled Engine Shutdown

Description The IST feature is internal to the PCM. The subsystems that contribute to the IST strategy have their own fault codes. The fault code for the IST is not a system diagnostic trouble code. The IST fault code is only set to indicate that the IST has been activated and the engine has shutdown. DTC 325 is set by the PCM when the cooling system temperature exceeds 107°C (225°C). At this temperature the PCM will reduce the fuel delivered to the engine.

Possible Causes · DTC 324 is set by the PCM when the engine has been shutdown due to exceeding the programmed idle time criteria. The IST feature must be enabled for DTC 324 to be displayed.

Diagnostic Aids DTC 324 does not indicate any system or circuit DTCs. Diagnostic checks are not required for DTC 324.

DTC 325 -- Power Reduced - Matched To Cooling System Performance

· When the temperature drops below 107°C (225°C ) the DTC will become inactive and the engine will return to normal operation.

For each Celsius degree of temperature the fuel will be reduced 6%. This reduces the heat produced by the engine and reduces the burden on the cooling system. The vehicle speed will also be reduced and allow the operator to downshift and increase the efficiency of the cooling system. As the temperature is reduced the compensation level is reduced until the temperature drops below 107°C (225°F ) and normal operation is resumed. Check oil level for contamination, debris, and correct API classification.

DTC 331 - Injection Control Pressure Above System Working Range

DTC 331 is set by the PCM when the injection control pressure is above normal working range of 25 MPa (3675 psi). When DTC 331 is active, the PCM will ignore feedback from the ICP sensor and control the IPR valve from programmed default values.

DTC 331 can be an indicator of a problem in the mechanical injection control pressure system, wiring, or ICP sensor. Possible causes for DTC 331 include the following: · Debris in engine · Incorrect grade of oil · Defective, stuck or plugged inlet on the IPR valve · IPR control wire shorted to ground · ICP sensor or circuit causing signal to be biased high The amber ENGINE indicator will be illuminated when DTC 331 is active.

Diagnostic Aids If the PCM sets DTC 332, the PCM will ignore the ICP signal and operate the IPR with fixed values based on engine operating conditions.

333 -- Injection Control Pressure Above/below Desired Level

DTC 333 is set by the PCM when the measured pressure does not match the pressure expected by the PCM. DTC 333 will be set if the measured value is less than or greater than 2.5 MPa (362 psi) of desired injection control pressure for a period greater than 7 seconds. When DTC 333 is active, the PCM will ignore feedback from the ICP sensor and control the IPR valve from programmed default values.

If ICP system was serviced, vehicle should be operated 20 miles to validate system performance.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 334 -- ICP Unable To Reach Set Point (Poor Performance)

Description DTC 334 indicates an injection control system response time fault and may be set during normal engine operation through the continuous monitor function or during the Engine Running Standard Test. DTC 334 compares measured ICP to desired ICP and looks for a large pressure difference of 9 MPa (1300 psi) for a period of 3 seconds. When DTC 334 is active, the PCM ignores the ICP sensor and controls the IPR valve operation from programmed default values.

Possible Causes · Low oil level in crankcase. · Contaminated engine oil. · Debris in engine oil. · Aerated engine oil. · Trapped air in the ICP system (particularly after an injector or high pressure pump replacement) · Intermittent IPR valve wiring connection. Spread IPR harness terminals at valve, poorly crimped terminals, or pulled-back pins. · Defective or stuck injection pressure regulator. · Leaks in ICP system. · Problem with ICP sensor or sensor circuit, incorrect sensor, system biased high or low. · Defective high pressure hydraulic pump. · Low oil level in crankcase · No lube oil pressure or lube oil delivery (reservoir empty or not filling) · Trapped air in the ICP system (particularly after an injector or high pressure pump replacement) · Leaks in ICP system · Defective or stuck injection pressure regulator · Loose high pressure hydraulic pump gear · Defective high pressure hydraulic pump · DTC 341 can be set due to an open or short to ground on the signal circuit, a defective sensor or an open VREF circuit or VREF short to ground. · When DTC 341 is active the amber ENGINE indicator is illuminated.

Diagnostic Aids DTC 344 can be set due to a plugged EBP sensor or a restriction in the tube leading to the sensor. To check for this condition, remove the sensor and tube and inspect for carbon deposits.

335 -- ICP Unable To Build Pressure During Cranking

DTC 335 is set after the PCM detects 8 to 10 seconds of engine cranking with less than 5 MPa (725 psi) of ICP. Engine cranking speed must be greater than 130 rpm before diagnostic trouble code detection can begin.

Engine cranking time varies with engine temperature. Verify ICP sensor and IPR wiring is connected. Check for oil leaks. Verify if system has been recently serviced (air entrapment). If ICP system was serviced, vehicle should be operated 20 miles to validate system performance.

341 -- Exhaust Back Pressure Signal Out Of Range Low

When the EBP signal voltage is detected out of range low, the PCM will cause the engine to ignore the EBP signal. The EGR valve will close and the PCM will rely on the VGT pre-programmed values.

DTC 341 is set by the PCM when the EBP signal is less than 0.039 volts for more than 0.5 seconds.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 342 -- Exhaust Back Pressure Signal Out Of Range High

Description When the EBP signal voltage is detected out of range high, the PCM will cause the engine to ignore the EBP signal. The EGR valve will close and the PCM will rely on the VGT pre-programmed values. DTC 343 is set by the PCM when the exhaust backpressure is greater than 260 kPa (37.7 psi).

Possible Causes · DTC 342 can be set due to an open signal ground circuit, short to a voltage source on the EBP signal circuit, or a defective sensor. · When DTC 342 is active the amber ENGINE indicator is illuminated. · EBP sensor bias high · EBP signal ground open · Exhaust restriction (muffler or catalytic converter) · VGT valve or vanes stuck closed · VGT Control Circuit short to B · EBP sensor bias high · EBP sensor or tube line plugged

Diagnostic Aids DTC 342 is set by the PCM when the EBP signal is greater than 4.9 volts for more than 0.5 seconds.

343 -- Excessive Exhaust Back Pressure (Gauge)

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

DTC 344 is set by the PCM when the EBP is greater than 300 kPa (43.5 psi) when engine is off or being cranked. DTC 345 is set by the PCM during the AMS test when the PCM measures the EBP and does not see the expected response in pressures.

Make sure all sensor, injector and actuator electrical DTCs have been repaired. Make sure all sensor, injector and actuator electrical DTCs have been repaired.

DTC 346 is set by the PCM during AMS test when the PCM measures EBP and EGRP and does not see the expected response in pressures versus position. DTC 351 is set by the PCM when less than 14.5 kPa (2.1 psi) is detected between key ON and 2500 rpm.

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

351 - Change In Exhaust Back Pressure Did Not Occur When Expected

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 353 - Variable Geometry Turbo Control Over Duty Cycle

Description DTC 353 is set when the PCM overcompensates by increasing duty cycle to the VGT to achieve desired boost/backpressure

Diagnostic Aids Make sure all sensor, injector and actuator electrical DTCs have been repaired.

354 -- Variable Geometry Turbo Control Under Duty Cycle

DTC 354 is set when the PCM overcompensates by decreasing duty cycle to the VGT to achieve the desired boost/backpressure.

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

355 -- Variable Geometry Turbo Overspeed

DTC 355 is set when the PCM detects turbo over speed several times in a specific period of time (dependent on PCM calibration). Turbo speed is estimated by engine speed, boost pressure, and barometric pressure.

Diagnostic Aids Make sure all sensor, injector and actuator electrical DTCs have been repaired.

DTC 365 - EGR Valve Position Above/Below Desired Level

DTC 365 is set when the actual EGR valve position does not match desired position.

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

DTC 366 - EGR Valve Duty Operating Out Of Expected Range

DTC 366 is set when the PCM has overcompensated by increasing or decreasing EGR duty to achieve the desired EGRP.

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

DTC 367 - Improper Position Signal When EGR Valve Is Expected Closed

DTC 367 is set when the PCM detects the EGR valve position is out of desired range during initial key ON (signal voltage greater than 2.5 volts). DTC 421-428 is set by the PCM when the rising time is too long on open or close coil. DTC 431-438 is set by the PCM when the rising time to 20 amps is short, but not zero on the open or close coil.

Make sure all sensor, injector and actuator electrical DTCs have been repaired.

421 through 428 -- Cylinder #1 through Cylinder #8 High Side To Low Side Open 431 through 438 -- Cylinder #1 through Cylinder #8 High Side Shorted To Low Side

(Continued)

· DTC 421-428 usually indicates a harness or coil is open. · DTC 431-438 usually indicates an internally shorted coil

The last digit in the injector DTC corresponds to the cylinder where a fault has been detected. The last digit in the injector DTC corresponds to the cylinder where a fault has been detected.

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 451 through 458 -- Cylinder #1 through Cylinder #8 High Side Short To Ground Or VPWR 523 -- IDM VPWR Voltage Low

Description DTC 451-458 is set by the PCM when the rising time to 20 amps is zero on the open or close coil. The IDM internally monitors battery voltage. When the IDM continuously receives less than 7 volts, a DTC will be set. DTC 525 is set by the PCM when there is an internal IDM failure. DTC 533 is set by the PCM when the voltage from the IDM power relay exceeds 16 volts.

Possible Causes · DTC 451-458 usually indicates the harness or coil is shorted to ground

Diagnostic Aids The last digit in the injector DTC corresponds to the cylinder where a fault has been detected. DTC 523 is set by the PCM when the voltage from the ignition switch is less than 7 volts. When DTC 525 is set, install a new IDM. DTC 533 can be set when jump starting the engine

· DTC 523 can be set due to poor connections between the IDM terminal X3-7 and the ignition switch. · IDM

525 -- IDM Fault

533 -- IDM Relay Voltage High

· DTC 533 can be set due to a generator voltage output of greater than 16 volts or an incorrect external battery connections exist. · DTC 534 can be set due to a defective generator, IDM power relay, discharged batteries or increased resistance in the battery feed circuits · DTC 543 can be set when the CAN 2 lines between the PCM and IDM are shorted to ground, VREF, battery or the current is open. · When DTC 543 is active the amber ENGINE indicator is illuminated. · DTC 551 can be set when the CMPO is open, or shorted to ground or shorted to a voltage source. If logic power is low, DTC 551 can be set. · DTC 552 can be set due to a camshaft incorrectly timed to crankshaft or an electrical noise creating a miscount on CMP location.

534 -- IDM Relay Voltage Lowa

DTC 534 is set by the PCM when the voltage from the IDM power relay is less than 7 volts.

IDM relay voltage is less than 7 volts.

543 -- PCM/IDM Communications Fault

DTC 543 is set by the PCM when the PCM is not communicating with the IDM.

If IDM power is low, DTC 543 can be set.

551 -- IDM/CMPO Signal Inactive

DTC 551 is set by the PCM when no CMPO signal is present while the CKPO is active.

DTC 551 can also be set when no CMPO/CKPO is present while the PCM reports it is in the run mode. The PCM continuously monitors the IDM. When the PCM fails to receive required continuous communication from the IDM, the PCM will set a DTC

552 -- IDM Incorrect CMPO Signal Signature

DTC 552 is set when the CMPO transition occurs at the wrong CKPO tooth.

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC DTC 553 -- IDM CKPO Signal Inactive

Description DTC 553 is set by the PCM when no CKPO signal is present while the CMPO is active.

Possible Causes · DTC 553 can be set when CKPO is open, shorted to ground, or shorted to a voltage source. DTC 553 can also be set if logic power is low. · DTC 554 can be set due to an electrical noise or a defective CKP sensor.

Diagnostic Aids DTC 552 can also be set when no CMPO/CKPO is present while the PCM reports it is in the run mode.

554 -- IDM Incorrect CKPO Signal Signature

DTC 554 is set by the PCM when CKPO signal has too few or too many transitions per engine rotation.

The PCM continuously monitors the IDM. When the PCM fails to receive required continuous communication from the IDM, the PCM will set a DTC. When DTCs are set for Cylinder Balance all Performance Diagnostics should be performed.

DTC 571 through 578 is set by the PCM when the IDM is unable to adjust fuel quantity to compensate for rough idle. PCM/IDM software is incompatible Engine Family Rating Code (EFRC) does not match PCM strategy level.

· Replacement of PCM or IDM · Incorrect Engine Family Rating Code (EFRC) selected for the PCM strategy programmed in the module. · Programmable parameters for the PCM were never programmed in module. (Usually occurs in new vehicle or new module). · Programmable parameters for the PCM incorrectly programmed in module. · Wrong EFRC selected for the PCM strategy programmed in the module · Programmable parameters for the PCM incorrectly programmed in module

Install correct PCM or IDM. Check EFRC and verify that it matches the PCM strategy level. Reprogram the PCM or change the EFRC as required. Program PCM.

621 -- Engine Using Mfg. Default Rating

Manufacturing defaults selected. Very low power (25 hp).

622 -- Engine Using Field Default Rating

Engine using Field Default Rating. Low power (lowest rating in engine class) and vehicle features not working. Invalid EFRC.

Program PCM.

623 -- Invalid Engine Family Rating Code (EFRC)

Check the EFRC and verify that it matches the PCM strategy level. Reprogram the PCM or change the EFRC as necessary. Program PCM.

624 -- Field Default Active

Vehicle features not functioning (Low power lowest rating in engine class).

(Continued)

2004 F650/F750 6.0L Diesel

6.0L Diesel Diagnostic Trouble Code (DTC) Descriptions

DTC 626 -- Unexpected Reset Fault

Description DTC 626 is set when power is interrupted to the PCM. Turning the ignition OFF and then ON will cause the code to change from active to inactive status.

Possible Causes · Loose or dirty connections at battery or ground cables can cause the PCM to power down · DTC 626 will not turn the amber ENGINE indicator on · Intermittent connections in the power feed wiring · Internal PCM fault

Diagnostic Aids The scan tool can be used to display the ignition switch voltage measured by the PCM. Monitor the voltage at PCM pins X4-1 and X4-2.

Programmable parameter list level incompatible. RAM programmable parameter list corrupt. The DTC will cause a no start or the engine to run in field defaults. Calibration level incompatible. The DTC will cause a no start or the engine to run in field defaults. Programmable parameter memory content corrupt. The DTC will cause a no start or the engine to run in field defaults.